Exam Details
| Subject | Refrigeration And Air Conditioning | |
| Paper | ||
| Exam / Course | Diploma in Mechanical Engineering (DMEVI)& B.Tech. MECHANICAL ENGINEERING 1-4 (BTMEVI) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2016 | |
| City, State | new delhi, |
Question Paper
State the basic principle of refrigeration. What is refrigerating effect Define ton of refrigeration.
A refrigeration system produces kg/hr of ice from water at 20°C. Find the refrigerating effect and tonnage of the unit. If power consumption is 1·5 kW, calculate the COP. Take enthalpy of solidification of water as 335 kJ/kg; and specific heat of water as 4·19 kJ/kg°C.
Explain the vapour compression refrigeration system with the help of T-s and p-h diagram.
Using an engine of 30% thermal efficiency to drive a refrigerator having a COP of what is the heat input into the engine for each MJ removed from the cold body by the refrigerator If this system is used as a heat pump, how many MJ of heat would be available for heating for each MJ of heat input to the engine?
What are the effects of CFCs on the environment? How do they affect the ozone layer
A refrigeration plant for a food store operates as a reversed Carnot heat engine cycle. The store is to be maintained at a temperature of and the heat transfer from the store to the cycle is at the rate of 5 kW. If heat is transferred from the cycle to the atmosphere at a temperature of 25°C, calculate the power required to drive the plant.
4.(a)What are the parameters to be considered in the selection of a refrigerant
Derive the expression for the maximum COP of a vapour absorption refrigeration system.
Discuss the factors affecting the performance of simple air refrigeration cycle.
Determine the ideal. COP of a vapour absorption refrigeration system in which the heating, cooling and refrigeration take place at 197°C, 17°C and respectively.
An open cycle air refrigeration system working between 1 atm and 12 atm produces 25 tons of refrigeration. The temperature of air leaving the cooler is 298 K and the temperature leaving the expander is 273 K Assuming the expansion and compression follow the law pV^1.35 constant, determine the following:
Mass of air circulated per minute
COP of the system
A refrigerator working on Bell-Coleman cycle operates between pressure limits of 1·05 bar and 8·5 bar. Air is drawn from the cold chamber at 10°C compressed and then cooled to 30°C before entering the expansion cylinder. The expansion and compression follow the law
pV^1.3 constant.
Determine the theoretical COP of the system.
A Freon-12 compression system, operating at a condenser temperature of 40°C and an evaporator temperature of develops 15 tons of refrigeration. Determine:
Mass flow rate of the refrigerant
Heat rejected in the condenser
Carnot COP and Actual COP of the cycle
What are the three major types of air-conditioning systems Explain anyone of them with a neat diagram.
8. Write short notes on any four of the following:
Vortex tube and Thermoelectric system
Psychrometry
Dry bulb temperature and Wet bulb temperature
Transport Refrigeration
Purification Of air in air-conditioning systems
Alternate Eco-friendly Refrigerant
A refrigeration system produces kg/hr of ice from water at 20°C. Find the refrigerating effect and tonnage of the unit. If power consumption is 1·5 kW, calculate the COP. Take enthalpy of solidification of water as 335 kJ/kg; and specific heat of water as 4·19 kJ/kg°C.
Explain the vapour compression refrigeration system with the help of T-s and p-h diagram.
Using an engine of 30% thermal efficiency to drive a refrigerator having a COP of what is the heat input into the engine for each MJ removed from the cold body by the refrigerator If this system is used as a heat pump, how many MJ of heat would be available for heating for each MJ of heat input to the engine?
What are the effects of CFCs on the environment? How do they affect the ozone layer
A refrigeration plant for a food store operates as a reversed Carnot heat engine cycle. The store is to be maintained at a temperature of and the heat transfer from the store to the cycle is at the rate of 5 kW. If heat is transferred from the cycle to the atmosphere at a temperature of 25°C, calculate the power required to drive the plant.
4.(a)What are the parameters to be considered in the selection of a refrigerant
Derive the expression for the maximum COP of a vapour absorption refrigeration system.
Discuss the factors affecting the performance of simple air refrigeration cycle.
Determine the ideal. COP of a vapour absorption refrigeration system in which the heating, cooling and refrigeration take place at 197°C, 17°C and respectively.
An open cycle air refrigeration system working between 1 atm and 12 atm produces 25 tons of refrigeration. The temperature of air leaving the cooler is 298 K and the temperature leaving the expander is 273 K Assuming the expansion and compression follow the law pV^1.35 constant, determine the following:
Mass of air circulated per minute
COP of the system
A refrigerator working on Bell-Coleman cycle operates between pressure limits of 1·05 bar and 8·5 bar. Air is drawn from the cold chamber at 10°C compressed and then cooled to 30°C before entering the expansion cylinder. The expansion and compression follow the law
pV^1.3 constant.
Determine the theoretical COP of the system.
A Freon-12 compression system, operating at a condenser temperature of 40°C and an evaporator temperature of develops 15 tons of refrigeration. Determine:
Mass flow rate of the refrigerant
Heat rejected in the condenser
Carnot COP and Actual COP of the cycle
What are the three major types of air-conditioning systems Explain anyone of them with a neat diagram.
8. Write short notes on any four of the following:
Vortex tube and Thermoelectric system
Psychrometry
Dry bulb temperature and Wet bulb temperature
Transport Refrigeration
Purification Of air in air-conditioning systems
Alternate Eco-friendly Refrigerant
Other Question Papers
Departments
- Centre for Corporate Education, Training & Consultancy (CCETC)
- Centre for Corporate Education, Training & Consultancy (CCETC)
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- School of Continuing Education (SOCE)
- School of Education (SOE)
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Subjects
- Advanced Dynamics Of Machine
- Automobile Engineering
- Combustion Engineering
- Computer Aided Manufacturing
- Computing Aided Design
- Design of Machine Elements
- Engineering Metallurgy
- Engineering Thermodynamics
- Experimental Stress Analysis
- Finite Element Analysis
- Fluid Mechanics
- Heat And Mass Transfer
- Heat Transfer
- I.C. Engines
- Industrial Engineering
- Industrial Ergonomics
- Industrial Measurement And Quality Control
- Industrial Organization And Management
- Kinematics and Dynamics of Machines
- Machine Design - I
- Machine Design-Ii
- Machine Drawing
- Machines Tools
- Maintenance Engineering
- Material Science
- Materials Handling
- Mechanical System Design
- Mechanical Vibration
- Mechanics Of Materials
- Mechatronics
- Metrology
- Metrology And Quality Control
- Non-Conventional Energy Resources
- Non-Destructive Testing
- Nuclear Power Engineering
- Optimisation Techniques In Engineering
- Optimization For Engineering Design
- Power Plant Engineering
- Power Transmitting Elements
- Product Development And Design
- Production And Operations Management
- Production Technology - Ii
- Production Technology-I
- Refrigeration And Air Conditioning
- Refrigeration System
- Robotics
- Safety Engineering
- Technical Entrepreneurship
- Thermal Engineering
- Thermal Engineering - I
- Thermofluid Engineering
- Total Quality Management (Tqm)
- Tribology
- Turbo Machines
- Unconventional Manufacturing Processes
- Welding Engg.